Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Visitante de Minnesota tem qual média de público presente?
 ###Tabelas: CREATE TABLE kit (kit_id AUTO_INCREMENT PRIMARY KEY, Year VARCHAR, Supplier VARCHAR, Chest VARCHAR, Sleeves VARCHAR, Back VARCHAR) CREATE TABLE waipa_district (waipa_district_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Years VARCHAR, Gender VARCHAR, Area VARCHAR, Authority VARCHAR, Decile INT, Roll INT) CREATE TABLE december (december_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Visitor VARCHAR, Score VARCHAR, Home VARCHAR, Decision VARCHAR, Attendance INT, Record VARCHAR) CREATE TABLE head-to-head_records_against_other_countries (head-to-head_records_against_other_countries_id AUTO_INCREMENT PRIMARY KEY, Games INT, Wins INT, Draws INT, Losses INT, Goals For INT, Goals Against INT, Goal Differential VARCHAR) CREATE TABLE editions_feature_grid (editions_feature_grid_id AUTO_INCREMENT PRIMARY KEY, Product VARCHAR, Extensions VARCHAR, Projects templates VARCHAR, MSDN integration VARCHAR, Debugging VARCHAR, Profiling VARCHAR, IntelliTrace VARCHAR, Unit test VARCHAR, Code coverage VARCHAR, Test impact analysis VARCHAR, Load testing VARCHAR, Lab management VARCHAR, Architecture and modelling VARCHAR, Windows Phone development VARCHAR)  
SELECT AVG Attendance FROM december WHERE Visitor = minnesota